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Mercury Transit: How We Scaled the Cosmos

As the Mercury transit unfolded over the Atacama Desert, astronomers remembered the pioneering calculations that were made to begin to understand the scale of the universe.

May 10, 2016
6:45 AM EDT
ESAC's Manuel Castillo chats to #MeetESO participants at Paranal Observatory next to the ESA's solar telescopes. | Ian O'Neill

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